You can adjust the pilot screw to add more fuel, but the way a carb works is this" for the firs 1/4 throttle, it's the pilot its doing most of the work. Once you get 1/4 to 3/4 or so, it's the needle jet and needle. After 3/4 throttle, it's the main jet. Of course, they all overlap, but this is why simply adjusting the fuel/air mixture screw won't change much at fuller throttle. Some good info here:I'm not very familiar with these particular carbs yet, but don't they just have a HSN I can richen up a smidge to support the added air flow? Everyone one seems to be in favor of re-jetting rather than richening up the mixture a tad, but I can't seem to figure out why.